<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <!-- 使用自定义的搜索组件 -->
    <view class="scroll-view-container">
      <!-- 左侧的划定区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}">
        <block v-for="(item,i) in cateList":key="i">
            <view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧的划定区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2":key="i2">
            <!-- 二级分类的标题 -->
            <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
            <!-- 当前二级分类下的三级分类列表 -->
            <view class="cate-lv3-list">
              <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                <!-- 三级分类的图片 -->
                <image :src="item3.cat_icon"></image>
                <!-- 三级分类的文本 -->
                <text>{{item3.cat_name}}</text>
              </view>
            </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins:[badgeMix],
    data() {
      return {
        //当前设备可用高度
        wh:0,
        cateList:[],
        active:0,
        //二级分类的列表
        cateLevel2:[],
        scrollTop:0
      };
    },
    onLoad() {
       const sysInfo=uni.getSystemInfoSync()
       this.wh=sysInfo.windowHeight-50
       this.getCateList()
    },
    methods:{
      //获取分类列表的数据
      async getCateList(){
        const {data:res}=await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!==200)return uni.$showMsg()
        this.cateList=res.message
        //为二级分类赋值
        this.cateLevel2=res.message[0].children
      },
      activeChanged(i){
        this.active=i
        //重新为二级分类赋值
        this.cateLevel2=this.cateList[i].children
        this.scrollTop=this.scrollTop===0?1:0
      },
      //跳转到商品列表页面
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container{
    display: flex;
    
    .left-scroll-view{
      width: 120px;
      
      .left-scroll-view-item{
        background-color: #f5f5f5;
        line-height: 60px;
        text-align: center;
        font-size: 12px;
        
        &.active{
          background-color: #dde7e2;
          position: relative;
          
          &::before{
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #547689;
            position: absolute;
            top: 50%;
            left: 0;
            transform: translateY(-50%);
          }
        }
      }
    }
    }
    .cate-lv2-title{
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
    }
    .cate-lv3-list{
      display: flex;
      flex-wrap: wrap;
      .cate-lv3-item{
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        margin-bottom: 10px;
        width: 33.33%;
        image{
          width: 60px;
          height: 60px;
        }
        text{
          font-size: 12px;
        }
      }
    }

</style>
